Final answer:
Sulla used Cinna as a pawn against Marius in Africa.
Step-by-step explanation:
The Rome leader that Sulla used as a pawn against Marius was Cinna. Cinna allied with Marius in their efforts to gain power in Rome. However, Sulla, who was a rival of Marius, took advantage of the situation and managed to manipulate Cinna against Marius.
Learn more about Sulla's manipulation of Cinna against Marius